This complete form must be submitted to the county's clerk of the court to set up the child support account. (See Texas Family Code §105.008) Note to Clerks: Send the completed form to the State Case Registry/ County Contact Team by fax: 877-924-6872, email: csd-sdu@oag.texas.gov, or mail to TxCSDU, P.O, Box 659400, San Antonio, TX 78265, or use the TXCSES Web Portal to provide this information in lieu of forwarding the document to the TXSDU. In Dallas, El Paso, Harris, Tarrant, Taylor and Travis counties, the completed form must be sent to the Domestic Relations Office.